Improvement in gates for gangs for marble-saws



UNITED STATES PATENT OFFICE.

LUGIUS B. ACLOGrSTON7 OF WEST RILAND; VERMONT.

IMPROVEMENT IN GATES FOR GANGS FOR MARBLE-SAWS.

Spec'ication forming part of Letters Patent No. 119,968, dated October 17, 1871; antedated September 30, 1871.

To all whom it may concern:

Be it known that I, LUcIUs B. CLoGsToN, of West Rutland, in the county of Rutland and State of Vermont, have invented a new and useful Improvement in Gates for Gang-Saws; and I do hereby declare that the following is a full, clear, and exact description thereof7 which will enable others skilled in the art to make and use the same, reference being had to the accompanying drawing forming a part of this specification.

My invention relates to a new Way of coupling together the sides and cross-pieces of a gangsaW gate by means of an intermediate coupling piece, fast to the cross-bars but sliding loosely in the tubular sides.

I am aware that tubular and channeled iron have been heretofore used to combine lightness tional view of the side tubes.

A represents the cross-bars7 preferably formed of channel iron; C, the side pieces, Vpreferably made tubular throughout their whole length; and B my coupling-plugs7 riveted to the crossbars7 but playing loosely in the tubes. A series of saws is placed between and parallel to the side pieces C at a suitable distance apart and strained to any desired tension while cold. As they are used the heat of friction causes them to expand and become elongated. It' the cross-bars are rigidly fastened at a fixed distance apart one of two things must occur; they must be either strained very loosely-at rst, so as not to work well7 and remain so until they reach some indefinite temperature and expansion; or they must be strained tight enough to work well in the iirst instance and successively keyed up as they work loose by expansion, according to the judgment of the operator, until the requisite tension is obtained. Neither of these give the desired accuracy or desired economy of labor. By making the coupling-plugs B self-adjustable in the side tubes C they can be strained to the proper degree of tension in the beginning and thus made automatically to adjust themselves to the elongation of the saws by expansion.

Having thus described all that is necessary to a full understanding of my invention7 what I esteem to be new, and desire to secure by Letters Patent, is-

In combination with ordinary cross-bars and side tubes A O the 4plugs B fast to the form er and working loosely in the latter7 as and for the purposes speciled.

' LUGIUS B. GLOGSTON. Witnesses:

IKE G. SHELDON,

CEAS. H. SHELDoN. (158) 

